Engineering Mechanics

Proceedings Vol. 7 (2001)

INŽENÝRSKÁ MECHANIKA 2001

ENGINEERING MECHANICS 2001

Copyright © 2001 Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Prague

 

Gajdoš L., Micka M.
pages 79 - +7p, full text

The problem of the load-carrying capacity of a thin-walled cylindrical shell, damaged by pitting and/or general corrosion and subjected to internal pressure, is solved for the concrete pipe of 520 mm in diameter and 5.9 mm in wall thickness, made from low-C steel CSN 411373. The solution is realized by both the engineering procedure and the numerical modelling using the finite element method. Both approaches are based on the attainment of the limit state in the region of the thinned wall of the shell. The engineering procedure consists in modification of the Maxey formula for the residual strength of a pipe containing a corrosion defect. The cut-out of the shell with a specific defect, loaded by the uniform internal pressure, is used as the numerical model. Parametric studies are performed by both methods and a graph is plotted of the dependence of the defect depth on its length at the instant offailure of the pipe for a given internal operating pressure.

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